added static php-crud-api

seatmap-webapi/docker/ubuntu16/Dockerfile

@@ -4,7 +4,7 @@ ARG DEBIAN_FRONTEND=noninteractive
 
 # install: php / mysql / postgres / tools / mssql deps
 RUN apt-get update && apt-get -y install \
-php-cli php-xml php-mbstring \
+php-cli php-xml \
 mariadb-server mariadb-client php-mysql \
 postgresql php-pgsql \
 postgresql-9.5-postgis-2.2 \